A spring scale reads 20 N as it pulls a 4 kilogram box across a table. What is the magnitude of the force exerted by the mass on the spring scale, if the frictional force is assumed to be equal to zero?

The velocity time - graph of a body undergoing uniform acceleration is Select one: a. not a straight line b. straight line parallel to x-axis c. straight line inclined to x-axis

Why electric forces are assential to forming compunds?

Energy is observed in two basic forms: potential and kinetic. Which of the following correctly matches these forms with a source of energy? a. the heat released from a living organism: potential energy b.

A cart is driven by a large propeller or fan, which can accelerate or decelerate the cart. The cart starts out at the position x = 0 m, with an initial velocity of + 5.

What is the study of physics

What is the energy source that heats a contracting protostar?

What unit is kg divided by m/s^2

If the energy stored in the fully charged battery is used to lift the battery with 100-percent efficiency, what height is attained? Assume that the acceleration due to gravity is 9.8 m/s2m/s2 and is constant with height

How does the mass of an astronaut change when she travels from earth to the moon? how does her weight change?

If an object has a mass of 20 grams and a volume of 40 cm3, what is its density in g/cm3?